An isolated number of customers experienced degraded performance in CS-EU Rules on the 3rd of January, 2024. This could have also intermittently impacted the ability to log into the application.
This incident was result of an elevated number of API requests coming from a single microservice. The unexpected increase led to a build-up of connections, impacting performance on a subset of API servers. Rate limiting functionality was not configured as expected in this case.
Once the affected systems and related traffic were identified, Isolating and restarting effected API services resolved the issue immediately.
We have corrected the rate limiter functionality for the microservice that caused this issue.